WO2015125813A1 - Laminate film, and film attachment method - Google Patents

Abstract

The present invention provides a laminate film which can be easily used by general users and which can prevent air bubbles and foreign substances from entering into the attachment surface even when manually attached in a general indoors environment in which foreign substances such as dust are floating around. The present invention also provides a film attachment method using the aforementioned laminate film. The present invention is a laminate film having a surface protection film, a foreign substance removal adhesive layer, a foreign substance removal film, a base material attachment adhesive layer, and a functional film in said order, wherein the joint strength of the base material attachment adhesive layer with the functional film is stronger than the joint strength of the base material attachment layer with the foreign substance removal film.

Description

Laminate film and film pasting method

The present invention relates to a laminated film and a film attaching method. More specifically, a laminated film suitable for attaching to the surface of a mobile display device such as a mobile phone or a tablet PC, and a film suitable for attaching such a laminated film on the user side such as homes and mass retailers. It relates to the pasting method.

Mobile display devices such as mobile phones and tablet PCs are likely to be damaged by hitting or scratching them. Conventionally, the user himself / herself manually attaches a protective film to the surface of the mobile display device. Generally done. Thus, when the user himself / herself attaches the film to the product, the film is attached in a general indoor environment that is not a controlled environment such as in a clean room or vacuum. However, in a general indoor environment, it was difficult to attach the film by hand while sufficiently preventing foreign matters and bubbles from entering between the product and the film.

As a method for attaching a film that can be carried out manually, and that can prevent entry of foreign matter and bubbles even in a general indoor environment, use soapy water, control of the attachment position of the film, and There is a method of air-drying after removing bubbles. This method is used when a professional film sticker attaches a film printed with a store logo or advertising material to a glass window, and has an advantage that the sticking position can be finely adjusted. However, this method is inconvenient and difficult to use for general users because it uses soapy water and takes time for air drying. In addition, although air bubbles can be sufficiently removed, there is room for improvement in preventing the entry of foreign matter.

Incidentally, various processing methods and apparatuses for preventing foreign matters and bubbles from entering the pasting surface are known as long as the situation in which a film is pasted on a product in a factory is mainly assumed. As a general method, there is a method in which attachment is performed in a clean room or in a vacuum (see, for example, Patent Document 1). For example, a large-scale clean facility has been introduced in the liquid crystal panel mounting process.

Patent Document 2 discloses a method of supplying a liquid having a temperature higher than room temperature and removing foreign matter and dirt on the surface of the liquid crystal panel. Patent Document 3 discloses a sticking device that automatically cleans the surface of a liquid crystal panel body before sticking a polarizing plate by a foreign matter cleaning roller.

Furthermore, a method for removing foreign substances by adsorbing them to an adhesive layer is also known. Patent Document 4 discloses a foreign matter removing pressure-sensitive adhesive tape that removes foreign matter adhering to the surface of a semiconductor wafer, a glass substrate or the like by adsorbing it to the adhesive layer surface. Patent Document 5 discloses a foreign matter removing sheet that is used by being attached to a conveying member, in which a separator for protecting the surface of the foreign matter removing layer is attached to the foreign matter removing layer by an adhesive layer. Yes.

In addition, although it does not prevent foreign matter existing in the vicinity when the film is attached, it does not prevent the adhesive layer from entering the attaching surface. There has been disclosed a screen protection sheet that can remove foreign substances adhering to a sticking layer in the manufacturing process by being applied and solidified. This screen protection sheet does not have a function of removing foreign matter on the screen to be pasted.

Similarly, it does not prevent foreign matter existing in the vicinity when the film is attached, but it is similar to the adhesive tape or sheet for removing foreign matter described in Patent Documents 4 and 5. A laminated structure having a configuration is disclosed in Patent Document 7. That is, in Patent Document 7, a long body with a pattern structure layer in which a long body is attached to one surface of a pattern layer film via an adhesive layer and a release film is attached to the other surface via an adhesive layer. A scale is disclosed.

JP 7-318919 A JP 2010-286664 A JP-A-8-50290 JP-A-8-274058 JP 2006-186026 A JP 2006-119186 A JP 2012-218353 A

As described above, conventionally, as a method for attaching a film capable of preventing the intrusion of foreign matter and bubbles, there is no method that can be easily used by a general user and can provide a sufficient effect. For example, in the method of attaching a film using soapy water, the surface on which the film is attached and the adhesive surface of the film are both exposed to the general indoor environment before the film is attached. For this reason, foreign matters adhere to those surfaces. Therefore, in the method of sticking a film using soapy water, there is a room for making it possible to sufficiently prevent the intrusion of foreign matters.

In the technique of Patent Document 1, a vacuum chamber is used. In the technique of Patent Document 2, a liquid having a temperature higher than room temperature is used. The technique of Patent Document 3 is premised on automation of processing by a pasting apparatus. Patent Documents 4 and 5 only disclose that foreign matters are removed by an adhesive tape or sheet for removing foreign matters. After the adhesive tape or sheet for removing foreign matters is peeled off, foreign matter and bubbles are prevented from entering. There is no disclosure of how to attach a film to a product while preventing it. The techniques of Patent Documents 6 and 7 do not prevent foreign matter existing around the film from entering the pasting surface when the film is pasted.

Here, as a premise for explaining the principle of the present invention, referring to FIG. 17, when a conventional laminated film having no foreign matter removing function is attached in a general indoor environment, The reason why foreign matters and bubbles intrude during this period will be described.

FIG. 17 is a schematic cross-sectional view showing a conventional method for attaching a laminated film. Hereinafter, based on FIG. 17, the procedure of bonding of the conventional laminated film will be described. (A) of FIG. 17 has shown the state of the base material 100 before bonding a laminated | multilayer film. In a general indoor environment that is not a controlled environment such as in a clean room or vacuum, a large number of minute foreign substances 200 such as dust are floating. For this reason, the foreign material 200 adheres to the surface of the substrate 100. Even when the surface of the base material 100 is cleaned before the laminated film is attached, if there is a time interval between the completion of cleaning and the attachment, the foreign matter 200 may be present on the surface of the base material 100 in a general indoor environment. It is difficult to avoid re-adhering. In this regard, no measures have been disclosed for the above-described method for removing foreign matter with the adhesive tape or sheet for removing foreign matter.

FIG. 17B shows a state of alignment of the conventional laminated film before being attached. The conventional laminated film shown in FIG. 17B has a configuration in which a separator film 211 is disposed on the lower surface of an optical film 217 via an adhesive layer 216.

Next, as shown in FIG. 17C, the separator film 211 is peeled off to expose the adhesive layer 216. Since the surface of the adhesive layer 216 exhibits adhesiveness, the foreign substance 200 floating in the indoor environment is likely to adhere.

Then, as shown in FIG. 17D, the optical film 217 is bonded to the base material 100 by bringing the adhesive layer 216 into close contact with the surface of the base material 100 by the bonding roller 241. At this time, if the foreign matter 200 adheres to the surface of the base material 100 or the adhesive layer 216, the foreign matter 200 enters between the base material 100 and the optical film 217. In addition, air bubbles may enter between the substrate 100 and the optical film 217. When the base material 100 is a screen of a display device, a portion where bubbles enter may appear as a white point, or a portion where foreign matter may enter may serve as a lens, which makes it difficult to see the screen display of the display device. . For this reason, there has been a demand for a method for attaching a laminated film that can prevent foreign substances and bubbles from entering even under a general indoor environment.

The present invention has been made in view of the above situation, and foreign matter and air bubbles invade the pasting surface even when it is pasted manually in a general indoor environment where foreign matter such as dust floats. It is an object of the present invention to provide a laminated film that can be prevented from being easily used by general users and a film attaching method using the same.

The present inventor does not require special environmental management or equipment at the time of pasting, and a functional film and a film that can prevent intrusion of foreign matters and bubbles even when pasted manually in a general indoor environment As a result of various examinations on the pasting method, even in a general indoor environment, many foreign substances such as dust are floating in the air, and even if the foreign substances on the base material to which the functional film is pasted are once removed The inventors paid attention to the fact that foreign matter adheres to the substrate and the adhesive surface of the functional film until immediately before the functional film is attached. Therefore, the present inventor removes the foreign matter on the base material immediately before attaching the functional film, and immediately after that, if the laminated film incorporates the foreign matter removal film capable of cleaning on the base material. It has been found that a film can be attached. Moreover, it discovered that it can prevent effectively also about a foreign material adhering to the adhesion surface of a functional film by devising a sticking method. As described above, the present inventor arrived at the present invention by conceiving that the above-mentioned problems can be solved brilliantly.

That is, one embodiment of the present invention includes a surface protective film, a foreign matter removing pressure-sensitive adhesive layer, a foreign matter removing film, a base material sticking pressure-sensitive adhesive layer, and a functional film in this order. The adhesive layer for attaching may be a laminated film having stronger bonding strength with the functional film than bonding strength with the foreign matter removing film.

Another aspect of the present invention includes a surface protective film, a foreign matter removing adhesive layer, a foreign matter removing film, a base material sticking adhesive layer, and a functional film in this order. The adhesive force of the adhesive layer for attaching may be a laminated film that is stronger than the adhesive force of the adhesive layer for removing foreign matter.

Yet another embodiment of the present invention is a film attaching method for attaching a functional film contained in the laminated film of the present invention to a substrate, comprising the following steps (1) to (5): A film sticking method may be used.
(1) The surface protective film is peeled off from the laminated film to expose the foreign matter removing adhesive layer. (2) The exposed foreign matter removing adhesive layer is brought into close contact with the surface of the base material. (3) Connect the vicinity of the region of the base material to which the laminated film is attached and the end of the functional film at the top of the laminated film with a connecting member (4 ) The adhesive layer for adhering the base material is peeled off from the film for removing foreign matter while the base material and the functional film are connected by the connecting member. (5) The adhesive for removing foreign matter from the surface of the base material. While peeling the layer and exposing the surface of the base material, the adhesive layer for attaching the base material is adhered to the exposed surface of the substrate, and the functional film is attached to the base material.

According to the laminated film of the present invention, even if foreign matter such as dust is present on the base material, the foreign matter on the base material is removed immediately before the functional film is attached, and then the functional film is immediately Therefore, it is possible to sufficiently prevent foreign matters and bubbles from entering the bonding interface. In addition, no special environmental management or equipment is required for bonding, and no liquid is used, so that it is easy for general users to use.

Further, the film sticking method of the present invention is based on the functional film without using the laminated film of the present invention so that foreign matter and air bubbles are mixed into the bonding interface even in a general indoor environment. Can be attached to the material. Further, unlike the conventional laminating method using soapy water, since it is a dry laminating method that does not use liquid, the working time can be greatly shortened and the work can be performed without soiling the periphery.

1 is a schematic cross-sectional view showing a laminated film according to Embodiment 1. FIG. It is a cross-sectional schematic diagram for demonstrating the method to affix the laminated film which concerns on Embodiment 1 on a base material. It is the schematic diagram which showed an example of the mechanism for affixing the laminated | multilayer film concerning Embodiment 1. FIG. It is the cross-sectional schematic diagram which showed an example of the sticking jig | tool suitable for the sticking mechanism of FIG. It is the plane schematic diagram which showed an example of the sticking apparatus provided with the sticking jig | tool of FIG. It is a cross-sectional schematic diagram for demonstrating the method of sticking an optical film with the sticking apparatus of FIG. It is explanatory drawing which showed affixing of the laminated | multilayer film with respect to the base material which does not have an unevenness | corrugation on the surface. It is explanatory drawing which showed affixing of the laminated film with respect to the base material with an unevenness | corrugation on the surface. It is the cross-sectional schematic diagram which showed an example of the laminated film provided with the cushion layer concerning Embodiment 3. It is the cross-sectional schematic diagram which showed another example of the laminated | multilayer film provided with the cushion layer which concerns on Embodiment 3. FIG. It is explanatory drawing which shows the state which bonded the laminated film to the base material with the adhesion layer for a foreign material removal. It is explanatory drawing which shows the state which the bonding to the base material of an optical film was completed. It is the cross-sectional schematic diagram which showed the general structure of the conventional liquid crystal display device. 6 is a schematic cross-sectional view showing a configuration of a liquid crystal display device of Embodiment 4. FIG. It is a side surface schematic diagram explaining the structure of the bonding jig | tool to a curved substrate. 1 is a schematic cross-sectional view showing a laminated film according to Example 1. FIG. It is the cross-sectional schematic diagram which showed the pasting method of the conventional laminated | multilayer film.

[Definition of terms]
In the present specification, each “film” is not limited by its thickness, and may be a “sheet”.

The value of the adhesive strength of the adhesive layer varies depending on the object to be applied and the measurement method, but in this specification, when evaluating the value of the adhesive strength of the adhesive layer, no alkali is used regardless of the actual object to be applied. A substrate made of glass is used as an object to be pasted, and a value obtained by the following measurement method is used. However, when evaluating the value of the adhesive strength of the pressure-sensitive adhesive layer with respect to the surface subjected to the easy peeling treatment, a substrate made of non-alkali glass having the same easy peeling treatment applied to the surface is used. In addition, although the absolute value of adhesive force changes with sticking objects, there exists a tendency for the magnitude relationship of adhesive force not to change.
(Measurement method of adhesive strength)
A film with a strip-like adhesive layer having a width of 25 mm is stuck on a horizontally fixed substrate. At this time, one end of the film is not attached to the substrate. One end of the film not attached to the substrate is sandwiched by a chuck of a tensile tester (peeling test jig), and a 90-degree peeling test (a tensile speed of 0.3 m / min) is performed.

Hereinafter, embodiments and examples of the present invention will be described with reference to the drawings, but the present invention is not limited to the following embodiments and examples. In addition, the configurations of the embodiments and examples may be appropriately combined or changed without departing from the gist of the present invention. In addition, in each embodiment, the same code | symbol is attached | subjected to the member which exhibits the same function.

[Embodiment 1]
(1) Configuration of Laminated Film FIG. 1 is a schematic cross-sectional view showing a laminated film according to the first embodiment. The laminated film 20 according to Embodiment 1 includes a separator film (surface protective film) 11, a foreign matter removing adhesive layer 12, a foreign matter removing film 13, a base material attaching adhesive layer 16, and an optical film (functionality). Film) 17 and the structure provided in order. The optical film 17 is positioned on the uppermost part of the laminated film 20 when being attached to the base material. In addition, the adhesion layer and the surface protection film may be laminated | stacked on the surface of the side in which the base material sticking adhesion layer 16 of the optical film 17 is not provided.

The separator film 11 protects the surface of the foreign matter removing pressure-sensitive adhesive layer 12 before use. It does not specifically limit as the separator film 11, For example, common films, such as a PET (polyethylene terephthalate) film, a PEN (polyethylene naphthalate) film, an acrylic film, a COP (cycloolefin polymer) film, can be used.

The foreign matter removing pressure-sensitive adhesive layer 12 is for adsorbing foreign matters on the surface of the base material to be bonded, and it is preferable that the adhesive force is much weaker than the base material sticking pressure-sensitive adhesive layer 16. . As the material for the foreign matter removing pressure-sensitive adhesive layer 12, pressure-sensitive adhesive materials classified as slightly sticky are suitable. Specifically, PF-AN422, PF-AN474 (above, manufactured by Lintec), ZBO-0421 (Fujimori Kogyo) Etc.). The adhesive strength of the foreign matter removing adhesive layer 12 is preferably 0.05 to 1 N / 25 mm width. When the width is less than 0.05 N / 25 mm, the adherend is easily peeled off, and workability is deteriorated. When the width exceeds 1 N / 25 mm, the adhesive strength may be stronger than that of the adhesive layer 16 for attaching a base material, and the first separator film 11 is difficult to peel off.

The foreign matter removing film 13 is for supporting the foreign matter removing pressure-sensitive adhesive layer 12. The foreign matter removing pressure-sensitive adhesive layer 12 and the foreign matter removing film 13 are integrally handled, and the sticking and peeling of the foreign matter removing film 13 mean simultaneously sticking and peeling of the foreign matter removing pressure-sensitive adhesive layer 12. The foreign matter removing film 13 is not particularly limited, and for example, a general film such as a PET (polyethylene terephthalate) film, a PEN (polyethylene naphthalate) film, an acrylic film, or a COP (cycloolefin polymer) film can be used. The foreign matter removing film 13 may be colored. Since it is easy to identify when it is colored, there is little possibility that it will be confused with other films and peeled off during the pasting operation. Moreover, since the film 13 for foreign material removal is a film finally removed from a base material, there is no disadvantage by coloring.

The adhesive layer 16 for attaching the base material is an adhesive layer for attaching the optical film 17 to the base material, and also has a role of integrating the film 13 for removing foreign matter and the optical film 17 in the laminated film 20. . The adhesive layer 16 for attaching the base material and the optical film 17 are handled integrally, and the attaching and peeling of the optical film 17 mean the attaching and peeling of the adhesive layer 16 for attaching the base material at the same time. As the material for the adhesive layer 16 for attaching the base material, a material that adheres firmly to the base material is suitable. Specifically, MO3014 (manufactured by Fujimori Kogyo Co., Ltd.), MCF-464, NCF-619 (hereinafter, Lintec) Etc.). The adhesive strength of the adhesive layer 16 for adhering the base material is stronger than that of the adhesive layer for removing foreign matter, and specifically, it is preferably 1 to 30 N / 25 mm width. When the width is less than 1 N / 25 mm, the adhesiveness of the foreign substance removing adhesive layer 12 as the lower layer is smaller than that of the lower layer, so that workability is deteriorated when the first separator film 11 is peeled off. When it exceeds 30 N / 25 mm width, it is difficult to peel off the adherend, and workability deteriorates.

Further, the surface of the foreign substance removing film 13 on the side of the adhesive layer 16 for adhering to the base material is subjected to an easy peeling treatment. Therefore, the adhesive layer 16 for adhering the base material is bonded to the film 13 for removing foreign substances. The bonding strength with the optical film 17 is stronger than the strength.

The optical film 17 is not particularly limited as long as it is a film having an optical function, and examples thereof include an antireflection film, an antiglare film, and a retardation film. The structure of the optical film 17 is not particularly limited, and may have a concavo-convex shape on the surface or a laminated structure. Examples of the structure (projection) that forms the uneven shape include a conical nanostructure. As a specific example of the optical film 17 having a concavo-convex shape on its surface, a moth-eye film having a moth-eye (brown eye) -like surface structure can be mentioned. Specific examples of the optical film 17 having a laminated structure include DBEF series manufactured by Sumitomo 3M. Examples of the material of the optical film 17 include PET (polyethylene terephthalate), PEN (polyethylene naphthalate), acrylic, and COP (cycloolefin polymer).

According to the laminated film according to Embodiment 1 described above, there is no foreign matter such as dust on the base material in the atmosphere in which foreign matter such as dust has floated by using the bonding method shown in FIG. Even when the optical film 17 is bonded to the base material, it is possible to prevent foreign matters and bubbles from entering the bonding interface.

(2) Laminate Film Affixing Method FIG. 2 is a schematic cross-sectional view for explaining a method for affixing the laminate film according to Embodiment 1 onto a substrate. Hereinafter, based on FIG. 2, the procedure of laminating | stacking the laminated film which concerns on Embodiment 1 is demonstrated.

(Procedure 1) The alignment laminated film 20 and the base material 100 are aligned. At this time, one side of the end portion of the laminated film 20 may be attached to the base material 100 with a connecting member such as the tape 30, and the laminated film 20 may be fixed to the base material 100. When there is a relatively large foreign object on the base material 100 or when dirt is attached, the surface of the base material 100 may be cleaned before the laminated film 20 is attached. Note that, except in an environment where foreign matter is artificially removed such as in a clean room or in a vacuum, the foreign matter 200 such as dust is usually floating in the air, and as shown in FIG. The foreign material 200 is also attached to the surface of the base material 100 to be bonded. The kind of base material 100 is not specifically limited, For example, a glass plate and a resin film are mentioned.

(Procedure 2) The stuck separator film 11 of the laminated film 20 is peeled off to expose the foreign matter removing adhesive layer 12. In this state, the laminated film 20 is attached to the base material 100 as shown in FIG. As a result, the foreign matter removing pressure-sensitive adhesive layer 12 and the surface of the substrate 100 are in close contact with each other, and the foreign matter 200 adhering to the surface of the base material 100 is adsorbed to the foreign matter removing pressure-sensitive adhesive layer 12. (1) When fixing with the tape 30 is not performed at the time of the alignment, one side of the end portion of the laminated film 20 is pasted with the tape 30 in the vicinity of the region where the laminated film 20 of the base material 100 is stuck. The laminated film 20 is fixed to the substrate 100. The tape 30 is attached to the end of the optical film 17 at the top of the laminated film 20. Further, it is desirable that the exposed adhesive layer 12 for removing foreign substances is sequentially pressed with a roller while the separator film 11 is peeled off, and is adhered to the substrate 100. As a result, air bubbles can be prevented from entering between the surface of the base material 100 and the foreign matter removing pressure-sensitive adhesive layer 12, so that the foreign matter 200 can be appropriately removed from the entire surface of the base material 100.

(Procedure 3) Separation of Foreign Film Removal Film 13 and Optical Film 17 With the surface of the foreign substance removal film 13 held down, the optical film 17 is pulled upward, as shown in FIG. The removal film 13 and the optical film 17 are peeled off. As a result, the laminated film 20 is opened in a V shape. At this time, the adhesive layer 16 for attaching a substrate is on the optical film 17 side.

(Procedure 4) Removal of the foreign matter removing film 13 and application of the optical film 17 The end of the foreign matter removing film 13 is peeled off from the tape 30. Next, the optical film 17 is sequentially pressed against the base material 100 by the laminating roller while pulling out the end of the foreign matter removing film 13 on the tape 30 side from the region between the base material 100 and the optical film 17. As a result, the base material 100 and the base material sticking adhesive layer 16 are brought into close contact with each other, and as shown in FIG. The optical film 17 is affixed. When pulling out the foreign matter removing film 13, a drawer rod may be used. In this case, the foreign substance removing film 13 can be peeled by inserting the drawer bar into the region between the substrate 100 and the optical film 17 and attaching the drawer bar to the foreign substance removing film 13 and then pulling out the drawer bar. As a drawer | drawing-out stick | rod, what equips the front-end | tip with attachment means, such as an adhesive member (for example, double-sided tape), a hook (hook part), is mentioned.

By peeling off the foreign matter removing film 13, the foreign matter 200 on the base material 100 is removed, and the surface of the base material 100 is exposed in a clean state. And in order to prevent a foreign material from entering a bonding interface, immediately after the surface of the base material 100 is exposed, the adhesive layer 16 for base material sticking is stuck. In order to continuously apply the optical film 17 while preventing foreign matter from entering the bonding interface, the foreign matter removing pressure-sensitive adhesive layer 12 is peeled off by winding the foreign matter removing film 13 with a take-up roller. It is preferable that the adhesion of the adhesive layer 16 for adhering the base material is performed by pressing with a sticking roller. In order to prevent foreign matter from entering the bonding interface as much as possible, the speed at which the foreign matter removing film 13 is peeled off (film winding speed) and the moving speed of the laminating roller (film bonding speed) are the same. It is preferable. From the viewpoint of continuously attaching the optical film 17, the speed at which the foreign matter removing film 13 is peeled off may be the same as or faster than the moving speed of the laminating roller 41.

In this embodiment, since the optical film 17 is bonded with the tape 30 fixed thereto, the optical film 17 can be bonded to the region where the foreign matter 200 has been accurately removed. Further, since the region from which the foreign matter 200 has been removed is covered with the optical film 17 immediately after the foreign matter removing film 13 is peeled off, the foreign matter 200 such as dust may adhere from the surroundings before the optical film 17 is attached. Is prevented.

In the present embodiment, in order to prevent the foreign matter 200 from dropping and adhering from above, it is important that the adhesive layer 16 for attaching the base material is not directed upward. For this reason, when peeling off the base material-adhering adhesive layer 16 from the foreign matter removing film 13, the optical film 17 is pulled in a direction that forms an angle of 0 ° or more and less than 90 ° with respect to the base material 100. Is preferred. Further, since it is easy to quickly peel off the foreign matter removing film 13 before the optical film 17 is attached, the time for exposing the adhesive layer 16 for attaching the base material is shortened, and the adhesive for attaching the base material is used. The foreign matter 200 can be sufficiently prevented from adhering to the layer 16.

(Procedure 5) Removal of tape Finally, if the tape 30 is removed, the application of the optical film 17 to the substrate 100 is completed.

According to the above-described attaching method, the optical film 17 can be attached to the base material 100 without the foreign matter 200 and air bubbles entering the bonding interface even in a general indoor environment. Further, unlike the conventional laminating method using soapy water, since it is a dry laminating method that does not use liquid, the working time can be greatly shortened and the work can be performed without soiling the periphery.

[Embodiment 2]
In the second embodiment, a mechanism and a jig for attaching a laminated film will be described. FIG. 3 is a schematic diagram illustrating an example of a mechanism for attaching the laminated film according to the first embodiment. As shown in FIG. 3, the foreign matter removing film 13 is wound up by rotating the peeling roller 43 and peeled off from the substrate 100. At the same time, the optical film 17 is bonded to the substrate 100 by moving the bonding rollers 41 and 42 toward the foreign matter removing film 13 while rotating them. At this time, the rotation speed of the peeling roller 43 is set to be equal or faster than the rotation speed of the bonding rollers 41 and 42. Further, the arrangement of the peeling roller 43 is preferably set to a minimum height that does not contact the base material 100 in order to avoid contact with the optical film 17. Tension is applied to the optical film 17 by a mechanism that applies tension such as a spring or a torque motor. The angle with respect to the base material 100 in the direction in which the optical film 17 is pulled is larger than the angle with respect to the base material 100 in the direction in which the foreign matter removing film 13 is peeled off, and small enough that the optical film 17 does not wind around the laminating roller 41. Is done. In addition, from the viewpoint of preventing foreign matter from entering the lower portion of the optical film 17 before pasting, the angle at which the optical film 17 is pulled is preferably smaller than the vertical direction with respect to the substrate 100. In addition, you may support the base material 100 by planes, such as a desk and a surface plate which have a smooth surface, without using the bonding roller 42. FIG.

The foreign matter removing film 13 and the optical film 17 may be provided with a pulling lead portion. The lead portion is a portion that extends from the main body portion of each of the films 13 and 17 and is made thinner than the main body portion. By providing the lead portion, it becomes easy to apply a uniform tension when the films 13 and 17 are pulled, so that the workability can be improved and the accuracy of bonding the optical film 17 can be improved. The lead portion may be a portion formed integrally with the main body portion of each film 13, 17, or may be a tape member (lead tape) attached to the main body portion of each film 13, 17. .

FIG. 4 is a schematic cross-sectional view showing an example of a bonding jig suitable for the bonding mechanism of FIG. In the bonding mechanism shown in FIG. 3, peeling by winding the foreign matter removing film 13 and sticking of the optical film 17 are performed in parallel. However, if the sticking jig shown in FIG. Can also be implemented. A characteristic configuration of the attaching jig shown in FIG. 4 will be described below. 4, the roller A corresponds to the bonding roller 41 in FIG. 3, and the roller C corresponds to the peeling roller 43.

(1) The rollers A, B, and C each have a rotation shaft fixed to the side plate 51. Therefore, the rollers A, B, and C can be moved at the same speed with respect to the base material 100 even manually. In order to rotate the same direction and at the same speed, the rollers A, B, and C are preferably connected to each other by a belt, a chain, or the like. Roller A is the same size as roller C.

(2) The roller A is a free rotating roller. The rotation axis of the roller A is connected to the cover 52 via the spring 53 and is suspended from the cover 52. When the laminated film before pasting is passed under the roller A, the cover 52 is lifted, and the roller A is arranged above the base material 100 so that a gap with the base material 100 is opened. When the optical film 17 is attached, the roller A is pressed against the optical film 17 by a method such as manually pressing the cover 52 from above.

(3) The roller B is a brake roller, and can feed the wound film when a certain tension is applied. On the roller B, the auxiliary tape having the maximum length for attachment is first wound, and the end (lead portion) of the optical film 17 is connected to the end of the auxiliary tape. During the attachment work to the optical film 17, the auxiliary tape is extended so that the work is easy, and then tension is applied. For this reason, the roller B is provided with a mechanism that regulates the rotation of the roller in one direction, such as a cam structure, and applies an initial tension by turning the roller B. However, the initial tension is preferably applied after the end of the optical film 17 is brought into contact with the substrate 100.

(4) The roller C is a brake roller that is connected to the roller A as described above and has a brake mechanism attached to the shaft of the roller so that a constant tension is applied to the torque. Similarly to the roller B, the roller C is attached to the foreign matter removing film 13 and applied with tension. The auxiliary tape wound around the roller C is bonded to the tensile portion (the right side in FIG. 4) of the foreign matter removing film 13. The roller C also includes a mechanism that regulates rotation of the roller in one direction.

(5) After connecting the optical film 17 and the roller B and connecting the foreign matter removing film 13 and the roller C, the end portion where the adhesive layer 16 for attaching the base material on the lower surface side of the optical film 17 is exposed to the base material 100. Overlap, and press it with roller A to bring them into close contact. In the pressed state, the roller C and the roller B are rotated by hand in the direction in which the tension is applied, and the optical film 17 and the foreign matter removing film 13 are applied in this order. When both the films 13 and 17 are under tension, the cover 52 is pressed by hand so that the roller A does not rotate and the pressure applied by the roller A is maintained, and the attaching jig is slowly moved to the left in FIG. The optical film 17 is pasted by moving.

(6) The cover 52 is made of a transparent body or a part thereof. The cover 52 and the side plate 51 are connected to each other by pins, whereby the cover 52 is fixed with respect to the side plate 51 in a rotation-free state. The cover 52 is configured to be detachable from the main body portion of the attaching jig. That is, the cover 52 can be easily separated from and integrated with the side plate 51 and the rollers A, B, and C. Therefore, the work may be performed by removing the cover 52 from the attaching jig as necessary. Alternatively, a hole may be formed in the cover 52, and a gas that does not contain foreign matter such as nitrogen gas may be introduced from the hole. If pasting is performed while introducing gas from the hole of the cover 52, it is possible to more effectively prevent foreign matter from entering the bonding interface.

FIG. 5 is a schematic plan view showing an example of a sticking apparatus provided with the sticking jig of FIG. In the attaching apparatus shown in FIG. 5, the base material 100 is fixed, and the attaching jig 106 in FIG. 4 is moved along the guide rail 103. As a result, the optical film 17 can be attached with high accuracy. It can be suitably used when the base material 100 to which the optical film 17 is attached is a small-sized material such as a portable device.

The configuration and usage method of the pasting apparatus shown in FIG. 5 will be described below. The base material 100 is placed on a fixed base 102 on the table 107 and fixed. The affixing jig 106 is connected to a slider 104 that moves on the guide rail 103 via a connecting jig 105 so that the affixing jig 106 can move along the guide rail 103. The end of the fixed base 102 and the guide rail 103 are arranged in parallel, and the connection jig 105 is arranged at a right angle with respect to the guide rail 103. When the slider 104 moves on the guide rail 103, the connecting jig 105 and the attaching jig 106 can move linearly in a direction parallel to the guide rail 103. Only one guide rail 103 may be provided, or two guide rails 103 may be provided on both sides of the fixed base 102 as shown in FIG.

FIG. 6 is a schematic cross-sectional view for explaining a method of attaching an optical film with the attaching device of FIG. As shown in FIG. 6, the base material 100 is fixed on the fixing base 102, the laminated film 20 is placed thereon, and the laminated film 20 is placed on the base material by the laminating roller 41 that is a part of the attaching jig 106. By pressure bonding to 100, the optical film 17 can be bonded.

[Embodiment 3]
Embodiment 3 demonstrates the case where a functional film is affixed with respect to the base material which has a level | step difference in the surface. Examples of the substrate having a step on the surface include a display device including a frame portion (outer frame) around the display portion. In such a display device, there is a step at the boundary between the display unit and the frame unit, and there are cases in which all four sides of the rectangular display unit are steps. In particular, there are many steps in medium to large display devices such as notebook computer screens, monitors, and televisions. As shown in FIG. 7, the bonding roller 141 is used for a base material that has no step between the upper surface of the display unit (which may be a front plate) 100A and the upper surface of the frame unit 100B and has no unevenness on the surface. It is easy to affix the laminated film of Embodiment 1 by pressing down with. However, as shown in FIG. 8, when a protrusion exists on the outer periphery of the base material, the height of the protrusion on the outer periphery becomes larger than the thickness of the laminated film to be pressed in the sheet configuration of the laminated film of Embodiment 1. Since the width of the laminating roller 141 is generally wider than the width of the substrate to be pressed, if there is a bulge on the outer periphery, the laminating roller 141 hits and the surface of the workpiece cannot be pressed, and the pasting can be performed. May not work. FIG. 7 is an explanatory diagram showing affixing of the laminated film to a substrate having no irregularities on the surface, and FIG. 8 is an explanatory diagram showing affixing of the laminated film to a substrate having irregularities on the surface.

The laminated film of the third embodiment has a substrate pasting pressure-sensitive adhesive layer 16 of the optical film (functional film) 17 of the first embodiment in order to affix a functional film to a substrate having an uneven surface. A cushion layer (buffer layer) made of an elastic body is provided on the side opposite to the contacting side. FIG. 9 is a schematic cross-sectional view illustrating an example of a laminated film including the cushion layer according to Embodiment 3, and FIG. 10 is a schematic cross-sectional view illustrating another example of the laminated film including the cushion layer according to Embodiment 3. FIG. The laminated film 21 in FIG. 9 has a configuration in which a cushion layer 27 is directly laminated on one surface of the optical film 17 via an adhesive layer 26. In the laminated film 22 of FIG. 10, a separator film 29 is laminated on one surface of the optical film 17 via an adhesive layer 28, and a cushion is provided on the opposite side of the separator film 29 from the adhesive layer 28 via an adhesive layer 26. The layer 27 has a stacked structure.

The cushion layer 27 preferably has flexibility and a hardness that can maintain the film shape when peeled. As the material of the cushion layer 27, a foam of a resin material is suitable, and as the resin material, a urethane resin, a butadiene resin, or the like is suitably used. As the cushion layer 27, for example, urethane foam (trade name: nipper lay, 5 mm thickness) manufactured by Nihon Hojo Co., Ltd. can be used.

The thickness of the cushion layer 27 is appropriately set according to the level of the step existing on the surface of the base material. When the optical film 17 is bonded to the base material 100, the cushion layer 27 is positioned at the upper end (base material) of the frame portion 100B. It is preferable to protrude from the upper end of the step on the surface. That is, the laminated film is not stuck to the base material 100 by the foreign matter removing adhesive layer 12 shown in FIG. 11, but the foreign matter removing adhesive layer 12 is peeled off from the surface of the base material 100 and the base material is attached. When the pressure-sensitive adhesive layer 16 is brought into close contact and the optical film 17 shown in FIG. 12 is bonded to the base material 100, the total thickness of the optical film 17, the pressure-sensitive adhesive layer 28, and the cushion layer 27 ( In the case of FIG. 9) or the total thickness (in the case of FIG. 10) of the optical film 17, the adhesive layer 28, the separator film 29, the adhesive layer 26 and the cushion layer 27 preferably exceeds the thickness of the frame portion 100 </ b> B. FIG. 11 is an explanatory diagram illustrating a state in which the laminated film is bonded to the base material by the foreign matter removing adhesive layer, and FIG. 12 is an explanatory diagram illustrating a state in which the optical film is bonded to the base material. . Moreover, it is more preferable that 50% or more of the cushion layer 27 is designed to protrude from the upper end of the frame portion 100B when the optical film 17 is bonded to the base material 100. The cushion layer 27 is usually designed to be the thickest when compared to the adhesive layer 16 for attaching a base material, the optical film 17, the adhesive layer 26, the adhesive layer 28, and the separator film 29. For example, the cushion layer 27 is about 0.5 mm to 10 mm. Is set. Further, as the material of the adhesive layers 26 and 28, it is preferable to use an adhesive material suitable for an optical material.

In the form of FIG. 9, the layers below the optical film 17 and in the form of FIG. 10 the layers below the separator film 29 are cut according to the size of the affixing portion of the base material 100, and the paste margin considering the misalignment. The cushion layer 27 cut slightly smaller than the size of each of the above layers is pasted together while leaving Although the roll of the product becomes large, the cushion layer 27 may be cut at the same time after being produced by roll-to-roll.

A bonding experiment was conducted using a display (manufactured by Sharp Corporation: monitor display LL-171G-W). Cutting of the film such as the optical film 17 was 3 mm inside from the surroundings. The level difference between the frame portion 100B and the display was about 2 mm. At the time of bonding, the laminated film protruded above the outer frame of about +3.5 mm. When a pressure was applied by the bonding roller, the pressure was transmitted to the optical film 17 through the cushion layer 27, so that the foreign film was not mixed, and there was no unevenness due to insufficient bonding pressure and no inclusion of bubbles.

[Embodiment 4]
In Embodiment 4, an example of a display device in which a frame portion (outer frame) forms a step will be described by exemplifying a liquid crystal display device.

FIG. 13 is a schematic cross-sectional view showing a general configuration of a conventional liquid crystal display device. As shown in FIG. 13, in the conventional liquid crystal display device, a step is formed at the boundary between the display surface of the liquid crystal panel 300 and the frame portion 100 </ b> B. The optical film 302A laminated via the plate 301 is made larger than the opening part of the frame part 100B opened corresponding to the image display area of the liquid crystal panel 300, and the end surface of the optical film 302A is the frame part 100B. It is designed not to be located in the opening. In such a configuration, it is necessary to remove the frame part 100B when replacing the optical film 302A, and it may be necessary to destroy the frame part 100B.

FIG. 14 is a schematic cross-sectional view showing the configuration of the liquid crystal display device of the fourth embodiment. In the configuration of FIG. 14, a step with a height of, for example, 0.1 to 20 mm is formed between the top of the protruding portion of the frame portion 100B and the surface of the liquid crystal panel 300. Then, when the width of the opening portion of the frame portion 100B is defined as A and the width of the optical film 302B disposed in the opening portion is defined as B, the liquid crystal panel 300 satisfies the relationship of AB> 0. An optical film 302B is disposed on the outermost surface. With such a configuration, the optical film 302B can be replaced without removing the outer frame 100B. As a result, it becomes easy to replace the optical film 302B attached to the surface of the liquid crystal panel 300 when it is damaged, or to replace the optical film 302B attached to the surface of the liquid crystal panel 300 with a state-of-the-art optical film as needed. . For example, a low reflection film such as a film having a moth-eye structure, an anti-glare (AG) film, a polarizing plate, a circular polarizing plate, an antifouling film, a hard coat (HC) film, a SAM film, or any other optical In the film, the reattachment can be simplified. Although the liquid crystal display device is exemplified as the display device of the fourth embodiment, a thin display device such as an organic EL display device (OLED) or a MEMS (Micro Electro-Mechanical System) shutter type display device is used. (FDP) or a display device with a touch panel may be used.

Note that the shape of the optical film 302B in plan view is generally preferably a rectangle having substantially the same shape as the display area, but even if there is a handle portion for peeling off by hand for replacement. Good. The handle portion can be formed by providing a protruding portion on a part of the long side or the short side of the portion (display portion) corresponding to the display area of the optical film 302B. As the shape of the protruding portion, a rectangular shape, a square shape, a semicircular shape, a trapezoid shape, or a shape obtained by rounding these corners can be used. Furthermore, there may be a dent line (cut line) on the boundary line between the display part and the handle part of the optical film 302B. The dent line may be a straight line or an intermittent dotted line.

[Embodiment 5]
Embodiment 5 demonstrates the film sticking method in case the sticking surface of a base material is a curved surface. For the attachment of the film, a weak adhesive layer made of a silicon-based slightly adhesive material is generally used. Although this silicon-based weakly adhesive layer is weak in adhesiveness (adhesion), it is in a close contact state when air is pushed out from the interface, and is particularly suitable for application to a flat glass plate. In some cases, peeling occurs at the end due to the elastic force of the film. In addition, peeling occurs even when it is attached to the surface of a polymer (resin material), the surface of an uneven surface (for example, an AG film), or the like. In the case of a resin material, the adhesive strength of the adhesive material is reduced on a hydrophobic surface with many weak C—H bonds. Since the slightly adhesive material is designed to have a low adhesion force, a slight decrease in adhesion force leads to peeling. On the uneven surface, the amount of deformation of the slightly adhesive material is small and cannot follow the unevenness, so that bubbles are easily drawn and stress starts to be peeled off from the peripheral portion.

On the other hand, if a strong adhesion layer is used, peeling can be suppressed. On the other hand, if a strong adhesive layer is used, it is difficult to re-paste, so it cannot be removed if foreign matter is bitten during sticking. Therefore, by using the laminated film of the present invention, it is possible to use a strong adhesive layer for attaching a functional film while preventing foreign matters from being mixed. Therefore, the laminated film of the present invention can be attached to a curved surface.

The process of attaching to a curved surface using the laminated film of the present invention is basically the same as in Embodiment 1, but the bonding jig shown in FIG. 15 is preferably used. FIG. 15 is a schematic side view illustrating the configuration of a jig for bonding to a curved substrate. As shown in FIG. 15, the bonding jig has a structure in which a curved surface bonding roll 142 and a columnar support drum 143 are arranged to face each other. The curved surface bonding roll 142 is coupled to an elastic body such as a spring or a piston, and is driven up and down (in the direction of the arrow in FIG. 15) with a constant pressure. On the support drum 143, a curved substrate 144 such as a curved display to which a film is attached is disposed. The support drum 143 is selected according to the curvature of the curved substrate 144, but the curved bonding roll 142 is separated from the drive system and is free in the rotation direction, or both of them can be adjusted using an adjustment jig. The difference in curvature may be eliminated. The film is attached by passing a laminated film including the foreign substance removing film 13 and the optical film 17 between the curved bonding roll 142 and the support drum 143 in a state where the curved substrate 144 is disposed on the support drum 143. Is done.

In addition, when using the bonding jig | tool of FIG. 15, it is preferable that the curvature of the support drum 143 and the curved substrate 144 is 30 mm (phi) or more. There exists a possibility that the film after bonding may peel that the said curvature is less than 30 mmphi. For example, when a strong pressure-sensitive adhesive (manufactured by Lintec Corporation, MO3014) is attached on a triacetyl cellulose (TAC) layer having a thickness of less than 30 mmφ and stored at 40 ° C. for 24 hours, an optical film Peeling occurred at the end of 17.

[Example 1]
As Example 1, an example of actually manufacturing the laminated film according to Embodiment 1 is shown. 16 is a schematic cross-sectional view showing the laminated film of Example 1. FIG. The laminated film of Example 1 has the configuration shown in FIG. 16, and the material and thickness of each layer are as follows.
Separator film 11: PET film, thickness 38 μm
Foreign matter removing adhesive layer 12: manufactured by Fujimori Kogyo Co., Ltd., (trade name) ZBO-0421, thickness 21 μm
Foreign matter removing film 13: PET film, thickness 38 μm
Adhesive layer 16 for substrate pasting: manufactured by Lintec Corporation, (trade name) MO3014, thickness 50 μm
Optical film 17: moth-eye film, thickness 70 μm
Adhesive layer 31: adhesive for moth-eye film (manufactured by Lintec), thickness 25 μm
Protective film 33: PET film, thickness 100 μm

As the 1st separator film 11, the foreign material removal film 13, and the protective film 33, all used PET film. PET film is slightly inferior in optical properties compared to PEN film and COP film, but it is excellent in mechanical strength and industrially mass-produced, so it is particularly suitable for films that do not require much optical properties. Yes.
(Characteristics of PET film)
Tensile strength: 200-290MPs
Transmittance: 89%
Haze: 2-3%
(Characteristics of PEN film)
Tensile strength: 200-290MPs
Transmittance: 89%
Haze: 2-3%
(Characteristics of COP film)
Tensile strength: 60-80MPs
Transmittance: 92%
Haze: 0.1% or less

The moth-eye film is a laminate having an upper layer portion made of an acrylate-based photocurable resin and a lower layer portion made of triacetyl cellulose (TAC). On the surface of the upper layer portion, protrusions with a height of 200 nm are provided at intervals of 200 nm, and the surface structure has a moth-eye shape. The material of the film for the optical element is selected according to the application, but a TAC film having a high transmittance (transmittance of 92%) is preferable. In order to improve water resistance and heat resistance, a COP film or the like may be used.

The adhesive strength of each layer in the laminated film of Example 1 was as follows. In addition, the value of adhesive force was measured with the following measuring methods, using the board | substrate which consists of non-alkali glass for a sticking object. However, since the surface of the foreign substance removing film 13 on the side of the base material sticking adhesive layer 16 has been subjected to an easy peeling treatment, the value of the adhesive strength of the base material sticking adhesive layer 16 is the same as that of the same. It measured using the board | substrate which consists of an alkali free glass with which the peeling process was given to the surface. In the following, the unit of adhesive strength is N / 25 mm width. Moreover, since the several sample was measured, the value of adhesive force was shown by the range.
Foreign matter removing pressure-sensitive adhesive layer 12 (interface with the separator film 11): 0.3 to 0.4
Adhesive layer 16 for substrate pasting (interface with foreign matter removing film 13): 1 to 2
Adhesive layer 31 (interface with optical film 17): 0.1 to 0.2

(Measurement method of adhesive strength)
A film with a strip-like adhesive layer having a width of 25 mm was pasted on a horizontally fixed substrate. At this time, one end of the film was not attached to the substrate. One end that was not attached to the substrate was sandwiched by a chuck of a tensile tester (peeling test jig), and a 90 degree peel test (pulling rate 0.3 m / min) was performed.

Since the laminated film of Example 1 is peeled in order from the lower film, it is preferable in the process that the adhesive strength is in the order of the foreign matter removing adhesive layer 12 <the base material attaching adhesive layer 16. Moreover, since workability | operativity will fall if the adhesive force of the adhesion layer 12 for a foreign material removal is too strong, the adhesion layer 12 for a foreign material removal uses the resin etc. with small adhesiveness and reaction fully completed, and an easily peelable type It is preferable to use an adhesive layer.

Moreover, the easy peeling process was made | formed on the upper surface of the film 13 for a foreign material removal. The adhesive layer 16 for attaching the base material had a stronger bonding strength with the optical film 17 than the bonding strength with the foreign matter removing film 13.

In the above embodiments and examples, the optical film is exemplified as the functional film. However, in the present invention, the type of the functional film is not particularly limited. As a functional film, the protective film used for uses, such as a building material and a showcase other than the optical film and protective film which are affixed on the surface of display apparatuses, such as a portable apparatus, a decoration film etc. are mentioned, for example.

Examples of the optical film suitable for the present invention include the following films (1) to (7), and two or more of the following films (1) to (7) may be used in combination. In addition, it is preferable to apply this invention to a functional film with an expensive functional film with a bad yield.
(1) Antireflection film Examples of the antireflection film include a film having a moth-eye structure and a film formed by laminating thin films having a low refractive index. A film with a moth-eye structure has a structure in which a plurality of protrusions are arranged at a pitch and height of 100 nm to several hundreds of nanometers, and prevents the interface reflection by continuously changing the refractive index at the interface with the air layer. The function to perform is demonstrated.
(2) By disposing the circularly polarizing plate on the surface of the circularly polarizing plate liquid crystal panel, it is possible to prevent the light incident on the liquid crystal panel from the outside and reflected inside the liquid crystal panel from being emitted to the outside. That is, reflection of external light on the display screen can be prevented. The reason is that the polarization state of the polarized light reflected inside the liquid crystal panel is rotated by 90 degrees when the phase difference changes by λ / 2, and is blocked by the circularly polarizing plate. When combined with the antireflection film of (1) above, both surface reflection and internal reflection can be suppressed, which is effective in improving display quality.
(3) Antifouling property, scratch resistance improving film Water-repellent and oil-repellent coating film is applied. Examples of the water / oil repellent film include a film obtained by solubilizing a fluorine polymer, coating and drying, and a film made of a siloxane material in which molecules having fluorine side chains are chemically bonded to the surface of a substrate by a reactive group. And a film having a low surface tension surface obtained by polymerizing a fluorine-based monomer or oligomer. Commercially available products include, for example, soluble fluoropolymer Cytop (Asahi Glass Co., Ltd.), fluorosurf release agent (Fluorosurf Co., Ltd.) and the like.
(4) SAM film A wide viewing angle film that diffuses light traveling straight in all directions with a fine wedge-shaped slope structure.
(5) The processing yield can be improved by laminating in a film touch panel roll shape and dividing the film after the application of the adhesive is completed. This is because an appropriate strength can be obtained by thickening the film at the time of bonding. In particular, when it is attached to a large-sized display device such as for signage, the yield improvement effect is great.
(6) About optical films for film building materials that cannot be used in clean rooms (scattering prevention film, heat ray cut film, antifouling film, antiglare (AG) film, scratch resistant film, antifogging film, etc.) Although it is possible to wash with water and stick with water, it is unavoidable that foreign matter is mixed in, and the on-site curing is also required due to the use of water. If the film structure or the film attaching method of the present invention is used, it is not necessary to use water, and foreign matter can be sufficiently prevented even outside the clean room.
(7) Thin glass (especially front plate)
The processing yield can be improved by laminating the film in a roll form and dividing the film after the adhesive coating is completed. At the time of bonding, an appropriate strength can be obtained by increasing the thickness of the film, which makes it difficult to break.

[Appendix]
The example of the preferable aspect of the laminated | multilayer film of this invention is given to the following. Each example may be appropriately combined without departing from the scope of the present invention.

It is preferable that the foreign matter removing film is subjected to a surface treatment for reducing the bonding strength with the base material sticking adhesive layer at the interface in contact with the base material sticking adhesive layer. Examples of the surface treatment include coating.

The foreign matter removing film is preferably colored.

The functional film is preferably an optical film. Examples of the optical film include a film having a moth-eye structure.

The functional film is preferably a protective film. The functional film may serve as an optical film and a protective film.

The laminated film may further have a buffer layer on the side of the functional film opposite to the side in contact with the adhesive layer for attaching the base material.

The example of the preferable aspect of the film sticking method of this invention is given to the following. Each example may be appropriately combined without departing from the scope of the present invention.

In the step (4), the adhesive layer for adhering the substrate is removed from the film for removing foreign matter by pulling the functional film in a direction that forms an angle of 0 ° or more and less than 90 ° with respect to the substrate. Peeling is preferable. The fewer the formation of V-shaped gaps due to the lifting of the functional film, the less the possibility of contamination.

In the procedure (5), the foreign matter removing pressure-sensitive adhesive layer is peeled off by winding the foreign matter removing film with a take-up roller, and the base material sticking pressure-sensitive adhesive layer is adhered to the sticking roller. Is preferably performed by pressing.

The winding speed of the foreign matter removing film is preferably the same as or faster than the attaching speed of the functional film.

In the above procedure (5), it is preferable to use a drawer bar having an adhesive member attached to the tip. It is also preferable to use a drawer bar provided with a flange at the tip.

The base material has a curved surface shape. In the procedure (2), the base material is disposed on a support drum having a columnar shape, and the bonding roller disposed to face the support drum and the above The laminated film may be attached to the substrate by passing the laminated film between the support drum and the support drum.

Still another aspect of the present invention is a display panel having an image display region, an optical film disposed on the outermost surface of the display panel, and an outer frame having a portion protruding from the outermost surface of the display panel. The optical film covers the image display area, and the outer frame may be a display device having an opening that exposes the entire area where the optical film is disposed.

11: Separator film
12: Adhesive layer for removing foreign matter 13: Film for removing foreign matter 16: Adhesive layer for attaching base material 17: Optical films 20, 21, 22: Laminated film 26, 28: Adhesive layer 27: Cushion layer (buffer layer)
29: Separator film 30: Tape 31: Adhesive layer 33: Protective films 41, 42, 141, 241: Laminating roller 43: Peeling roller 51: Side plate 52: Cover 53: Spring 100: Base material 100A: Display unit 100B: Frame part (outer frame)
102: Fixing base 103: Guide rail 104: Slider 105: Connection jig 106: Pasting jig 107: Table 142: Curved surface bonding roll 143: Support drum 144: Curved substrate 200: Foreign material 211: Separator film 216: Adhesive layer 217: Optical films A, B, C: Roller 300: Liquid crystal panel 301: Polarizing plate 302A, 302B: Optical film

Claims (14)

A surface protective film;
An adhesive layer for removing foreign matter;
A film for removing foreign matter;
An adhesive layer for attaching a substrate;
Functional film in order,
The adhesive film for pasting a base material has a stronger bonding strength with the functional film than a bonding strength with the foreign matter removing film. The surface treatment which reduces the joint strength with the said adhesive layer for base-material affixing is made | formed in the interface which contacts the said adhesive layer for base-material affixing, The said foreign material removal film is made | formed. Laminated film. A surface protective film;
An adhesive layer for removing foreign matter;
A film for removing foreign matter;
An adhesive layer for attaching a substrate;
Functional film in order,
The laminated film characterized in that the adhesive force of the adhesive layer for pasting a base material is stronger than the adhesive force of the adhesive layer for removing foreign matter. The laminated film according to any one of claims 1 to 3, wherein the foreign matter removing film is colored. The laminated film according to any one of claims 1 to 4, wherein the functional film is an optical film. 5. The laminated film according to claim 1, wherein the functional film is a protective film. The laminated film according to any one of claims 1 to 6, wherein the laminated film further has a buffer layer on a side opposite to a side of the functional film in contact with the adhesive layer for attaching the base material. the film. A film attaching method for attaching the functional film contained in the laminated film according to any one of claims 1 to 7 to a substrate,
A film sticking method comprising the following steps (1) to (5):
(1) The surface protective film is peeled off from the laminated film, and the foreign matter removing adhesive layer is exposed. (2) The exposed foreign matter removing adhesive layer is closely adhered to the surface of the base material. (3) Connect the vicinity of the region of the substrate where the laminated film is pasted to the end of the functional film at the top of the laminated film with a connecting member (4 ) While the base material and the functional film are connected by the connecting member, the base material-adhering adhesive layer is peeled off from the foreign material removing film. (5) The foreign material removing adhesive material from the surface of the base material. While peeling the layer and exposing the surface of the base material, the adhesive layer for attaching the base material is adhered to the exposed surface of the substrate, and the functional film is attached to the base material. In the step (4), by pulling the functional film in a direction to form an angle of 0 ° or more and less than 90 ° with respect to the base material, the base material sticking adhesive layer is removed from the foreign matter removing film. It peels, The film sticking method of Claim 8 characterized by the above-mentioned. In the step (5), peeling of the foreign matter removing adhesive layer is performed by winding the foreign matter removing film with a take-up roller, and adhesion of the base material attaching adhesive layer is performed by an attaching roller. The method for attaching a film according to claim 8 or 9, wherein the film is applied by pressing. The film sticking method according to claim 10, wherein a winding speed of the foreign matter removing film is the same as or faster than a sticking speed of the functional film. The film sticking method according to any one of claims 8 to 11, wherein, in the step (5), a drawer bar having an adhesive member attached to a tip is used. The film sticking method according to any one of claims 8 to 11, wherein, in the step (5), a drawer bar provided with a flange at the tip is used. The base material has a curved shape,
In the step (2), the base material is disposed on a support drum having a columnar shape, and the laminated film is passed between a bonding roller disposed to face the support drum and the support drum. Thus, the method for attaching a film according to any one of claims 8 to 13, wherein the laminated film is attached to the substrate.

Images